The vast majority of Icelanders living in Iceland are "registered" asLutheran Christians, but in modern times, Icelanders are secular people with low church attendance. A recent poll shows that about 62% of Icelanders are "non-theist", but no one really does bother expressing it or "registering themselves out of the Lutheran Church".
I once asked my friend (though we were about 10) "do you believe in god?" He said: "well, yeah, but no yeah, yes no maybe, I don't know?", Which does sort of show how a large percentage of Icelanders "don't really care". "Or know", for that matter..
There is a Roman Catholic Church in Iceland, but only about 2% of the population are Catholic, and more than half of them are Eastern European immigrants. The majority of these immigrants arrived in the 21st century, and Catholics were about 1% of the population before most of these immigrants arrived.
Roman Catholicism is the largest non Lutheran religion in Iceland.
Islam
Most people in the middle east practice islam
Most Taiwanese practice a combination of Buddhism, Confucianism and Taoism.
Judaism (75%).
Christianity, I guess
Islam
Christianity, which is the majority religion in all of South America.
Roman Catholic
Most people in the US who profess any religion profess to be Christians. There are many denominations of Christianity in the US.
The same as most of Europe: Christianity.
Most people in the Middle East today practice Islam.
They practice Roman Catholic religion